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Samenvatting Klopto 1.4 gezichtsvelden

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samenvatting me plaatjes van het eerste HC Klopto 1.4 gegeven door pascal

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Uploaded on
September 7, 2017
Number of pages
2
Written in
2017/2018
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Summary

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Klopto gezichtsvelden 1.4
Bij welke aandoeningen kan er gezichtsveld uitval voorkomen?
- Retinitis pigmentosa
- Venatak occlusie
- Herseninfarct
- Macula degeneratie
- Glaucoom
- Venacentralis occlusie
- AION
- Neuritis optica
- Ablatio retinae
- Arterie rak occlusie
- Arterie centralis occlusie
- Tumor
- aneurysma

Er zijn verschillende hoogtes in de visus:
- Maximale visus in de macula (0˚)
- Een lager gelegen punt heeft een lagere visus
• Bijvoorbeeld in de periferie
- De visus is gerelateerd aan de visuele sensitiviteit
• Hoe hoger de gevoeligheid, des te hoger de visus
- Gerelateerd aan de verdeling van de fotoreceptoren in de retina
• Minder fotoreceptoren in de periferie
- Lagere gevoeligheid
- • Stimulus moet groteren helderder zijn om gezien te worden

Hoe groot is het gezichtsveld:
- Temporaal: 100 graden
- Nasaal en superior: 60 graden
- Inferior: 75 graden

Horizontaal kunnen we over 200 graden kijken
Verticaal over 135 graden

Blinde vlek (n opticus)
- Geen fotoreceptoren
- Geen stimuli zichtbaar
- Horizontaal 5,5 graden en verticaal 7,5 graden

Een gezichtsveld defect ontstaat door een probleem in het oog, de oogzenuw, het chiasma
opticum of verder in de hersenen.
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